Added README.md

Author: vishalraj82

README.md

@@ -0,0 +1,43 @@
+This is a sample work to learn about docker, containers, running MySQL in docker and setting up MySQL
+replication using docker containers.
+
+Here is the directory structure and its explanation
+
+    MySQLReplDocker
+        |
+        +--- conf/
+        |       |
+        |       +--- master1.cnf
+        |       +--- master2.cnf
+        |       +--- slave1.cnf
+        |       +--- slave2.cnf
+        |
+        +--- data/
+        |       |
+        |       +--- master1/
+        |       +--- master2/
+        |       +--- slave1/
+        |       +--- slave2/
+        |
+        +--- docker/
+        |       |
+        |       +--- master-2-slave.yml
+        |       +--- master-2-master.yml
+        |       +--- slave-2-master-2-master-2-slave.yml
+        |
+        +--- scripts/
+        |       |
+        |       +--- common-functions.sh
+        |       +--- master-2-slave.sh
+        |       +--- master-2-master.sh
+        |       +--- slave-2-master-2-master-2-slave.sh
+        |
+        +--- start.sh
+        +--- stop.sh
+        +--- check_params.sh
+
+
+The folder "conf" contains the MySQL configuration for master and slave nodes.
+The folder "data" contains folders to hold data for master and slave nodes.
+The folder "docker" contains the docker container configuation files
+The folder "scripts" contains bash script which does the real job of setup of replication between the nodes

docker/master-2-slave.yml

@@ -1,6 +1,6 @@
 version: "3"
 services:
-    _1:
+    master_1:
         image: mysql:5.7.27
         hostname: ${MASTER_1_HOSTNAME}
         volumes: